SOHC.co.uk Forums > CB750

burning oil. head off to do valve seals but...

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Graeme77:
As title.
valve seals seem ok, all dry except number 4 which had lots of oil in the bore. So I know why its smoking on start up but dont know why there is oil in the bore.
The oil seems to be coming from around the stud and leaking past the head gasket. Its number 13 stud in the tightening order. It doesnt have an o ring so im guessing there shouldnt be oil here to start with? With the head off its still full of oil around that stud so is it just going to be getting past the nut and washer? Can oil come up around this stud? Can it drain away from this stud?
I can see no obvious problems with any seating surface and all torques were good.

Graeme77:
One other thing, the 8 studs that hold the cam towers, should they all be studs? 2 of mine are bolts, and they have stripped the thread in the head. Ill helicoil it so not too big a deal but just wondered.
Oh, and while im at it, should the 6 10mm head bolts be tight? Mine werent. Its been apart before obviously but not by me. I have a photocopy of the factory manual but its a but vague.

Thanks.

bytio:
Only 4 should be studs on cam towers,. These need to be thread sealed as oil will leak past them because the holes go to the outside world!

Trigger:
What 750 engine would be a great clue as the K has many differences and the F has a couple of differences. Any pictures ?

Graeme77:
Sorry, 750f1 1976.
I can take pics of anything you need, ill take a few general onesbin a bit.

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